Every Windows project has a custom target (included from pyproject.props) that generates a header with definitions for resource files.

Those definitions (PYTHON_DLL_NAME and FIELD3) can be passed directly to resource compiler.

Another definition (MS_DLL_ID) doesn't need to be a resource at all. It was used in the past to initialize PyWin_DLLVersionString in dl_nt.c, but that code is now dead.